Temporal Dynamics of Irrigation Characteristics in South Carolina

Irrigation plays a vital role in stabilizing crop production under climatic variability in the southeastern United States. However, limited long-term empirical evidence exists on how irrigation practices, water sources, and energy demands have evolved in South Carolina. The aim of this study was to examine temporal changes in irrigation characteristics in South Carolina. The analysis utilized two decades (2003–2023) of data from the United States Department of Agriculture – National Agricultural Statistics Service, Irrigation and Water Management Surveys. Results showed a 65% increase in the number of irrigated farms and 260% expansion in irrigated acreage over the twenty-year period. Groundwater irrigation increased sharply with irrigated area from wells by 639%, accompanied by deeper well construction (175 ft to 377 ft) and higher pumping capacities (327 to 524 GPM). Sprinkler irrigation, particularly center pivot systems became the dominant irrigation method, accounted for most irrigated acreage. Energy expenditures for irrigation increased by 639%, reflecting higher energy intensity associated with deep groundwater extraction and pressurized irrigation systems. Improvements in infrastructure reliability reduced yield losses from equipment failure and water shortages. Overall, irrigation expansion in South Carolina has enhanced production resilience but increased dependence on groundwater and energy resources. These findings underscore the need for integrated strategies that balance water productivity, energy efficiency, and aquifer sustainability in future irrigation planning.